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https://github.com/c64scene-ar/llvm-6502.git
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5d0f7af3dc
It includes a pass that rewrites all indirect calls to jumptable functions to pass through these tables. This also adds backend support for generating the jump-instruction tables on ARM and X86. Note that since the jumptable attribute creates a second function pointer for a function, any function marked with jumptable must also be marked with unnamed_addr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210280 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.5 KiB
LLVM
47 lines
1.5 KiB
LLVM
; RUN: llc <%s -jump-table-type=single | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @f() unnamed_addr jumptable {
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ret i32 0
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}
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define i32 @g(i8* %a) unnamed_addr jumptable {
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ret i32 0
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}
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define void @h(void ()* %func) unnamed_addr jumptable {
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ret void
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}
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define i32 @main() {
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%g = alloca i32 (...)*, align 8
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store i32 (...)* bitcast (i32 ()* @f to i32 (...)*), i32 (...)** %g, align 8
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; CHECK: movq $__llvm_jump_instr_table_0_[[ENTRY:1|2|3]], (%rsp)
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; CHECK: movl $__llvm_jump_instr_table_0_[[ENTRY]], %ecx
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%1 = load i32 (...)** %g, align 8
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%call = call i32 (...)* %1()
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call void (void ()*)* @h(void ()* bitcast (void (void ()*)* @h to void ()*))
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; CHECK: movl $__llvm_jump_instr_table_0_{{1|2|3}}, %edi
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; CHECK: callq h
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%a = call i32 (i32*)* bitcast (i32 (i8*)* @g to i32(i32*)*)(i32* null)
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; CHECK: callq g
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ret i32 %a
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}
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; CHECK: .globl __llvm_jump_instr_table_0_1
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; CHECK: .align 8, 0x90
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; CHECK: .type __llvm_jump_instr_table_0_1,@function
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; CHECK: __llvm_jump_instr_table_0_1:
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; CHECK: jmp {{f|g|h}}@PLT
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; CHECK: .globl __llvm_jump_instr_table_0_2
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; CHECK: .align 8, 0x90
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; CHECK: .type __llvm_jump_instr_table_0_2,@function
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; CHECK: __llvm_jump_instr_table_0_2:
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; CHECK: jmp {{f|g|h}}@PLT
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; CHECK: .globl __llvm_jump_instr_table_0_3
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; CHECK: .align 8, 0x90
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; CHECK: .type __llvm_jump_instr_table_0_3,@function
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; CHECK: __llvm_jump_instr_table_0_3:
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; CHECK: jmp {{f|g|h}}@PLT
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